Switch-lock.



W. ANDERSON.

SWITCH LOOK.

APPLICATION FILED AUG.29. 1910 Patented May 9, 1911.

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SWITCH LOOK.

APPLICATION nun no.2. 1910.

W. ANDERSON.

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I OIIII Plrll: NJIIAsMIIIa n UNITED STATES PATENT OFFICE.

WILLIAM ANDERSON, OF MEMPHIS, TENNESSEE, ASSIGNOR, BY DIRECT AND MESNEASSIGNMENTS, 0F THIRTY-TWO ONE-HUNDREDTHS TO WILLIAM FAY AND G. G.HALLOWAY, OF MEMPHIS, TENNESSEE, AND THIRTY-FIVE ONE-HUNDREDTHS TO JOHNFITZGERALD, OF ST. LOUIS, MISSOURI.

SWITCH-LOCK.

Specification of Letters Patent.

Patented May 9, 1911.

Application filed August 29, 1910. Serial No. 579,542.

To all whom it may concern:

Be it known that I, WILLIAM ANDERSON, a citizen of the United States,residing at Memphis, in the county of Shelby and State of Tennessee,have invented certain new and useful Improvements in Switcl1Locks; and Ido declare the following to be a full, clear, and exact description ofthe invention, such as will enable others skilled in the art to which itappertains to make and use the same.

This invention relates to improvements in switch locks.

One object of the invention is to provide an improved key operatedlocking mechanism which when unlocked and the lever swung around to openthe switch, will prevent the removal of the key until the lever is againswung back into position for closing the switch.

Another object is to provide a lock of this character having meansadapted to be reversed to permit the use of either a right or left handkey.

With the foregoing and other objects in view, the invention consists ofcertain novel features of construction, combination and arrangement ofparts as will be more fully described and particularly pointed out inthe appended claims.

In the accompanying drawings: Figure 1 is a front view of the upperportion of a switch stand illustrating the application of the inventionand showing the lever in full lines in locked position and in dottedlines in an operative position. Fig. 2 is a side View of the same; Fig.8 is a plan view of the lock case with the cover plate removed showingthe lever locking mechanism in locked position; Fig. 4 is a verticallongitudinal sectional view on the line 44 of Fig. 3 showing the partsin locked position; Fig. 5 is a similar View showing the parts in openor released position; Fig. 6 is a vertical cross section on the line 6-6of Fig. 3; Fig. 7 is a detail longitudinal section on the line 77 ofFig. 3 showing the construction of the key actuated operating mechanism;Fig. 8 is a detail perspective View of the key actuated operatingmechanism shown in Fig. 7; Fig. 9 is a similar View of the reversiblekey hole plate which permits the use of either a right or left hand key.

Referring more particularly to the drawings, 1 denotes a portion of theswitch stand in which is arranged the switch operating shaft 2, thelower end of which is operatively connected to the switch tongue in anysuitable manner (not shown). The upper end of the operating shaftprojects through and above the upper end of the switch stand and said(projecting upper end of the shaft is 'adapte to receive a target orother form of signal (not shown).

Keyed or otherwise rigidly secured to the projecting upper end of theshaft 2 is an operating head 3, said head being hollow or provided witha longitudinal recess 4. In the outer end of the head 3 andcommunicating with the recess 4: therein is a notch 5 in which ispivotally mounted the inner end of an operating lever 6 which when swungupwardly to a horizontal position provides means whereby said head andthe switch operating shaft may be turned to open or close the switch.\Vhen the lever 6 is swung downwardly at right angles to the head 3,said lever will be engaged with a locking notch 7 in the edge of the topplate of the stand which will prevent the head from being turned and theswitch thus opened. The head 3 is arranged on the shaft 2 in such mannerthat when the head and shaft have been swung around to the properposition for closing the switch the lever 6 will be in line with thenotch 7 in the switch stand.

In order to lock the lever 6 into engagement with the notch 7 in thestand, I provide a suitable key operated locking mechanism, the key ofwhich when turned to a position for releasing the locking mechanismcannot be removed therefrom until said mechanism has again been locked.The locking mechanism for the lever 6 comprises a bolt 8 which isarranged in a longitudinal recess 9 formed in the upper portion of thehead 3 adjacent to one side thereof. The bolt 8 is pivotally connectedto the head at one end of the recess 9 and is provided on its oppositeend with a downwardly projecting plate 10 in which is formed a notch 11adapted to receive the end of a key inserted through a suitable key hole12 in one side of the head. When the key is inserted in the hole 12 andin engagement with the recess 11 and turned, the ward thereof willengage the upper wall of the notch or recess 11 of the bolt and willlift this end of the latter. The bolt 8 is provided with a laterallyprojecting locking arm or bar 13 which projects through a suitable notch14: in the head 3 and into the recess 4 formed in the head.

In the inner end of the lever 6 is formed a notch in which is pivotallysecured the outer end of a bifurcated locking pawl or dog 15, the innerend of which is adapted to be engaged with stop shoulders 16 and 17formed in the lower wall of the recess 4: of the head. When the lever 6is swung down to an operative position for engaging the locking notch inthe upper plate of the switch stand, the pawl 15 will be drawn forwardlyto a position wherein the inner end thereof will drop into engagementwith the stop shoulder 16 which will securely hold the lever 6 in lockedengagement in the notch in the top plate of the switch stand, thuspreventing the lever or the head 3 from being swung around on the standand positively preventing the opening of the switch as long as theseparts are in locked position. The arm 13 of the bolt 8 projects throughthe bifurcated inner end of the pawl 15 whereby when the bolt is raisedby the turning of the key the pawl will also be raised thus permittingthe lever 6 to be swung upwardly to a horizontal position and out ofengagement with the locking notch in the top plate of the switch stand.When the lever is thus swung up, the end of the pawl 15 will be broughtinto engagement with the stop shoulder 17 in the recessed portion of thehead. After the lever has thus been swung upwardly and the parts broughtto the position described, the lever and head may be swung around on theupper end of the stand to turn the switch operating shaft in the properdirection for opening the switch. When the key has been manipulated toswing the bolt and pawl upwardly the ward thereof will be carried intoengagement with the wall of the head above the keyhole and the key willbe held against withdrawal until after the head has again been swungaround and the lever swung downwardly into engagement with the notch inthe top plate of the switch stand in which position the switch will haveagain been closed thus insuring the closing of the switch by thebrakeman or operator before he can remove the key from the head 3. Inorder to retract or depress the bolt 8 after the key has been turnedtherein I preferably provide a flat leaf spring 18 which is arranged inthe upper portion of the recess containing the bolt 8 and which bearsagainst the latter as shown. I

In order to provide for the use of a right or left hand key inconnection with the locking mechanism, I provide a reversible key holeplate 19 which is loosely engaged with a notch or recess 20 formed inthe wall of the recess occupied by the bolt 8. On the upper side of thehead is arranged a cover plate 21, said plate having at the outer end adownwardly projecting flange adapted to fit over and engage the outerend of the head 3. The cover plate 21 is preferably secured in positionon the head 3 by means of a fastening bolt 22 which is arranged throughthe head and cover plate and is provided on its upper end with a platefastening nut 23. The head of the bolt 22 is preferably countersunk inthe lower side of the head 3 thus permitting the head to freely turn onthe upper end of the switch stand.

From the foregoing description taken in connection with the accompanyingdrawings, the construction and operation of the invention will bereadily understood without requiring a more extended explanation.

Various changes in the form, proportion and the minor details ofconstruction may be resorted to without departing from the principle orsacrificing any of the advantages of the invention as defined in theappended claims.

Having thus described my invention, what I claim is:

1. A switch lock comprising a head, a combined locking and operatinglever pivotally mounted to engage said head, a pawl arranged in saidhead and pivotally connected to the inner end of said lever whereby thelatter is secured in a locking position, and a. key operating boltarranged within the head in engagement with said pawl to lift the sameand thereby release said lever whereby the latter and said head may beactuated to open the switch.

2. A switch lock comprising a recessed head, an operating leverpivotally mounted in one end of said head, a pawl arranged in the latterand pivotally mounted in the inner end of said lever, stop shouldersformed in the recess of said head and adapted to be engaged by the innerend of said pawl whereby when the latter is engaged with one of saidnotches said lever will be secured in a locked position, a pivotedreleasing bolt, a releasing arm formed on said bolt and adapted toengage said pawl whereby when the bolt is operated the pawl will beraised and said lever thereby released thus permit-.

ting the same and said head to be operated for the purpose of opening aswitch.

end of the lever to enga e the head and In testimony whereof I havehereunto set having a notched inner en a key operated my hand inpresence of two subscribing Witbolt arranged in said head, an armprojectnesses.

ing laterally from the bolt and engaging the WILLIAM ANDERSON. notch inthe end of the pawl, and a spring Witnesses:

arranged in the head and bearing upon the E. J. BOWMAN,

bolt. L. E. ANDERSON.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. G.

